<!doctype html>
<html lang="zh">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link href="{{ url_for('static', filename='main.css') }}" rel="stylesheet">
    <title>Hello, world!</title>
</head>
<body>
{% block body %}
{% endblock %}
</body>
</html>